The Route Distinquisher (RD) is added to the beginning of a VPN customer's IPv4 prefix to create a globally unique VPNv4 prefix for routing over the Layer 3 VPN. The IPv4 hosts that connect to a VRF must have unique IPv4 addresses. To eliminate duplicate IPv4 address issues between VRFs, configure a unique RD for each VRF.
To configure or unconfigure an RD, use the following commands:
configure vr vrf_name rd [2_byte_as_num:4_byte_number | ip_address:2_byte_number | 4_byte_as_num:2_byte_number]
unconfigure vr vrf_name rd